For the past five years, Lin has looked after the son (Yo-yu) and elderly mother (Mrs. Chou) of his deceased boyfriend (Li-Wei). It is Lin’s way of remembering Li-wei — by continuing to be in the life he once had and loving the people he once loved. The pain and joy Lin experiences every day makes him feel as though Li-wei is still alive.

While they may live together like a family, in the eyes of outsiders, Lin is merely a tenant living in the rooftop flat above Mrs. Chou’s property. A kindhearted stranger.

But when Mrs. Chou passes away and Yo-yu’s uncle (Li-gang) rushes back from overseas, it is discovered that ownership of Mrs. Chou’s property was transferred to Yo-yu, who has been legally adopted by Lin. In other words, the property is now effectively under Lin’s control.

Suspicious of the circumstances surrounding his mother’s death, Li-gang contacts the police. One after another, Lin’s secrets are exposed by the ensuing investigation, and people’s perceptions about him begin to change. There is even evidence suggesting Mrs. Chou really may have been murdered. As the evidence mounts against him, Lin comes to the realization he may soon be separated from Yo-yu…