Geeureun Namjaui Yongmang Switch

Jae-Hyeon has always gotten everything that he wanted, but the housekeeper's son, Eun-Hae, was the one person that he desired above anything else. So when Jae-Hyeon heard that Eun-Hae's moving away, of course he's going to push him down the stairs. Eun-Hae loses his memory due to the accident, and Jae-Hyeon decides that he will never desire anything ever again. However, an unexpected reunion with Eun-Hae triggers Jae-Hyeon's desires to come rushing back...

(Source: Lezhin US)