Bahng Do-yun is a high-level, dangerous drug dealer who lives a life of constant violence, evidenced by the frequent bandages and medical tape on his body. He uses his time with Yul-seo as a rare psychological escape from his gritty reality. While he is remarkably gentle with her, he is terrified of showing true affection. He believes that if he allows Yul-seo to fall in love with him, she will become a target for his enemies. His coldness is actually a misunderstood act of love; he is deeply in love with her but denies it to ensure her survival.