Dongdong and the Female Tenant

For every injured person, God sends an angel to heal him. Everyone who lives in a black box has an angel who brings sunshine to him. Dongdong locked himself in a black box due to family changes. He ate instant noodles every day and lived a messy life. He was in a daze and the house was rented out with a female tenant. She was his angel, taking him out of the pain and towards the sunshine. But in the end, when he found that he fell deeply in love with her, she left him... And she had fallen in love with him. She lied to him to leave again and again because of her eye disease, but he was obsessed with her. What will happen to him and her?