KICK THE BUCKET

Kick the Bucket summary:

Jinseop, a withdrawn and unassuming intern at a large corporation, has a dark obsession: stalking Taeyoung, the charismatic and seemingly perfect deputy manager of his team.Jinseop becomes fixated, hoarding items tied to him; whether discarded objects or things briefly touched. However, Jinseop's adoration turns to fury when he discovers Taeyoung lobbying the chairman for a promotion. Driven by a sense of betrayal, Jinseop crafts a sinister plan to blackmail Taeyoung to strip away his pride and transform him into a submissive pet.'