Yo-yu is a nine-year-old orphan who lives with his grandma and Mr. Lin, the tenant in their rooftop flat. Lin looks after Yo-yu and tends to the daily needs of Grandma, who suffers from late-stage diabetes. 

In everyone’s eyes, Lin is a kindhearted gentleman.

But when Grandma passes away, everything changes. Yo-yu’s uncle, Li-gang, returns to Taiwan only to discover that ownership of Grandma’s apartment was transferred to Yo-yu, who has been legally adopted by Lin. In other words, the property is now effectively under Lin’s control.

Li-gang contacts the police with his suspicions. An autopsy finds narcotics in Grandma’s system at the time of her death, prompting an investigation that reveals a very different side to Lin. Police recover a deleted gay sex app on Lin’s cell phone, and one of his hookups turns out to be a drug dealer. 

Just as he is about to be arrested for Grandma’s murder, Lin takes Yo-yu and flees deep into the mountains …