diff --git a/README.md b/README.md
index 061c807..5f30302 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,7 @@ Join link: [Google meet](https://meet.google.com/jyx-mxnq-kpk)
 
 ## 2026 1Q meetup list
 
+- [280th, 2026-03-28](https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/535), joined 3
 - [279th, 2026-03-21](https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/533), joined 2
 - [278th, 2026-03-14](https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/531), joined 3
 - [277th, 2026-03-07](https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530), joined 5
@@ -494,24 +495,25 @@ and participate more than 30 online meetup, get the chicken gifticon.
 
 |Ranking|Name|Count|
 |-------|----|-----|
-|1|[Kim Jong Feel](https://github.com/jongfeel/)|12|
+|1|[Kim Jong Feel](https://github.com/jongfeel/)|13|
 |2|[최지윤](https://github.com/chichoon/)|11|
 |3|[Yeshin Lee](https://github.com/yeslee-v/)|6|
 |4|[LeeDaYeon](https://github.com/ErigoLee/)|5|
-|5|[TaeWon](https://github.com/ytw9699/)|5|
+|5|[TaeWon](https://github.com/ytw9699/)|6|
 |6|[Daewon Paeng](https://github.com/fora22/)|1|
 |7|[ARi](https://github.com/hyunhyee/)|1|
 |8|[Harry Ho](https://github.com/hemil0102/)|1|
+|9|[LoGinShin](https://github.com/loginshin/)|1|
 
 ### All from first to present
 
 |Ranking|Name|Count|
 |-------|----|-----|
-|1|[jongfeel](https://github.com/jongfeel/)|273|
+|1|[jongfeel](https://github.com/jongfeel/)|274|
 |2|[최지윤](https://github.com/chichoon)|181|
 |3|[yeslee-v](https://github.com/yeslee-v/)|109|
 |4|[Jeongan Lee](https://github.com/fkdl0048/)|51|
-|5|[TaeWon](https://github.com/ytw9699/)|49|
+|5|[TaeWon](https://github.com/ytw9699/)|50|
 |6|[Byeongguk Ahn](https://github.com/nonoaa/)|37|
 |7|[Joseph-Cha](https://github.com/Joseph-Cha/)|34|
 |8|[hyuncho](https://github.com/aquamagic9/)|33|
@@ -558,6 +560,7 @@ and participate more than 30 online meetup, get the chicken gifticon.
 |49|[3Cat-jaguar](https://github.com/3Cat-jaguar)|1|
 |50|[KyungDong Yoo](https://github.com/yugd1211/)|1|
 |51|[Harry Ho](https://github.com/hemil0102/)|1|
+|52|[LoGinShin](https://github.com/loginshin/)|1|
 
 ### Ranking history
 
diff --git a/Stamp/README.md b/Stamp/README.md
index 4942384..98cf1d8 100644
--- a/Stamp/README.md
+++ b/Stamp/README.md
@@ -26,8 +26,9 @@
 
 | Name | 01-03 (268th) | 01-10 (269th) | 01-17 (270th) | 01-24 (271th) | 01-31 (272th) | 02-07 (273th) | 02-14 (274th) | 02-21 (275th) | 02-28 (276th) | 03-07 (277th) | 03-14 (278th) | 03-21 (279th) | 03-28 (280th) |
 |-|-|-|-|-|-|-|-|-|-|-|-|-|-|
-| [Kim Jong Feel](https://github.com/jongfeel/) | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/514#issuecomment-3706592905"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/515#issuecomment-3731404198"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/517#issuecomment-3762491965"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/518#issuecomment-3793377941"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/519#issuecomment-3827142452"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/524#issuecomment-3863335319"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/525#issuecomment-3900442926"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/527#issuecomment-3937918033"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/528#issuecomment-3976025335"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015188160"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/531#issuecomment-4059108870"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/533#issuecomment-4101820180"><img src="approved_1Q.png"/></a> | 
-| [TaeWon](https://github.com/ytw9699/) | | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/518#issuecomment-3793606675"><img src="approved_1Q.png"/>book 15/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/519#issuecomment-3827006937"><img src="approved_1Q.png"/>book 16/20</a> | | | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015148739"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 17/20</a> | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/533#issuecomment-4102006890"><img src="approved_1Q.png"/><img src="approved_1Q.png"/>book 18/20</a> | 
+| [Kim Jong Feel](https://github.com/jongfeel/) | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/514#issuecomment-3706592905"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/515#issuecomment-3731404198"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/517#issuecomment-3762491965"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/518#issuecomment-3793377941"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/519#issuecomment-3827142452"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/524#issuecomment-3863335319"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/525#issuecomment-3900442926"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/527#issuecomment-3937918033"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/528#issuecomment-3976025335"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015188160"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/531#issuecomment-4059108870"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/533#issuecomment-4101820180"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/535#issuecomment-4147452908"><img src="approved_1Q.png"/></a> | 
+| [LoGinShin](https://github.com/loginshin/) | | | | | | | | | | | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/535#issuecomment-4145996835"><img src="approved_1Q.png"/><img src="approved_1Q.png"/>book 1/20</a> | 
+| [TaeWon](https://github.com/ytw9699/) | | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/518#issuecomment-3793606675"><img src="approved_1Q.png"/>book 15/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/519#issuecomment-3827006937"><img src="approved_1Q.png"/>book 16/20</a> | | | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015148739"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 17/20</a> | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/533#issuecomment-4102006890"><img src="approved_1Q.png"/><img src="approved_1Q.png"/>book 18/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/535#issuecomment-4146341660"><img src="approved_1Q.png"/><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 19/20</a> | 
 | [최지윤](https://github.com/chichoon) | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/514#issuecomment-3706579591"><img src="approved_1Q.png"/>book 16/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/515#issuecomment-3726416555"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 17/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/517#issuecomment-3748315626"><img src="approved_1Q.png"/>book 18/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/518#issuecomment-3793340101"><img src="approved_1Q.png"/>book 19/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/519#issuecomment-3802717566"><img src="approved_1Q.png"/>book 20/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/524#issuecomment-3863284869"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/><img src="approved_1Q.png"/>book 1/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/525#issuecomment-3900425233"><img src="approved_1Q.png"/>book 2/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/527#issuecomment-3937871053"><img src="approved_1Q.png"/><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 3/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/528#issuecomment-3948929982"><img src="approved_1Q.png"/><img src="approved_1Q.png"/>book 4/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015429862"><img src="approved_1Q.png"/>book 5/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/531#issuecomment-4059105742"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/><img src="approved_1Q.png"/>book 6/20</a> | 
 | [Harry Ho](https://github.com/hemil0102/) | | | | | | | | | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/531#issuecomment-4059113118"><img src="approved_1Q.png"/><img src="approved_1Q.png"/>book 1/20</a> | 
 | [LeeDaYeon](https://github.com/ErigoLee/) | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/514#issuecomment-3706578972"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 3/20</a> | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/518#issuecomment-3793343060"><img src="approved_1Q.png"/>book 4/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/519#issuecomment-3827095902"><img src="approved_1Q.png"/>book 5/20</a> | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/525#issuecomment-3900394490"><img src="approved_1Q.png"/>book 6/20</a> | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015090784"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 7/20</a> |