Angels lead the way to the afterlife when humans die; Seul-bi is an angel who's in charge of Woo-hyun's neighborhood; she saves Woo-hyun by coincidence and her life takes a new turn; Woo-hyun couldn't just leave Seul-bi alone so he takes her home.

Woo-hyun falls into the pool and can't stand up due to his fear of water; Seul-bi and Sung-yeol jump in to save Woo-hyun; Seul-bi becomes a student at Woo-hyun's school and she struggles to find Woo-hyun's lost necklace.

Woo-hyun begins to have feelings for Seul-bi, but also feels anxious that one day, Seul-bi might leave; someone in Woo-hyun's class cheats during the exam.

Woo-hyun, Sung-yeol and Seul-bi get closer thanks to Jae-seok's mean acts; watching them getting closer, Ji-hye goes to Mal-suk and asks Woo-hyun to transfer; Seul-bi is confused with her feelings for Woo-hyun.

Things have become complicated for Seul-bi with Woo-hyun's confession of love; she's found a way to return home but she's hesitating because of Woo-hyun.