Cheon Gi Dot Com 1-2

Jun Hui wakes up to find strange bruises on her body. She asks her childhood friend, Min Yu, the son of a fortune teller whose fortunes always seem to come true, what is going on. He tells her that she is linked with another spirit and that whatever happens to him happens to her.

It turns out that this spirit is Han Sung, who has the same bruises she has because he was in a fight the day before. She begins following him around in order to protect herself and he begins to think she likes him (although she couldn't care less about him).