Operation Water Ghost

Kwon Hee-mang lives the life of an unemployed, stay-at-home hikikomori with no particular job or friends. But one day, after an unexpected accident, she gains the ability to see ghosts, and she ends up with a ghost named Kim Sarang clinging to her after meeting her in the hospital. Kim Sarang tells Hee-mang that she will obediently leave Hee-mang's body if she helps her resolve her lingering regret—dying just one month after finally confessing to and dating the man she had a crush on. Before Hee-mang can even respond, Sarang possesses her body and rushes off to find him. Possessed, Hee-mang tracks down Woo Taemin, a popular college student eight years younger than her, and aggressively kisses him without warning. Mortified, Hee-mang flees in shame, while Taemin finds the whole incident strangely exciting. (Source: Cleaniverse)