Lee's Secret!! (リーの秘密!!, Rī no himitsu) is chapter 210 of the Naruto manga.
Lee reminds Naruto that he promised Sakura that he would bring Sasuke back to Konoha. Naruto leaves Kimimaro to Lee and follows Sasuke. Back in Konoha, Guy races to Tsunade as soon as he returns from his mission. She informs him that Lee's surgery was a complete success, and both are then informed that Lee has left the hospital. Tsunade notices that Lee has forgotten his medicine, accidentally taking her sake instead. Guy is horrified by the news. Lee and Kimimaro begin fighting but Kimimaro has no difficulty predicting and blocking Lee's strikes. After Lee takes a short break to take his "medicine", he become drunk and assumes a Drunken Fist stance.