Description：Kang Junsu (Lee Seung-gi) and Kim Hyun-woo (Moon Chae-won) are childhood sweethearts. Kang Junsu has always liked Kim Hyun-woo silently. However, when he decided to express his feelings to her, he was rejected by Kim Hyun-woo. Despite this, Kang Junsu still stayed by Kim Hyun-woo's side and became her closest and most trusted friend. Kim Hyun-woo is a weather anchor. She is cheerful and lively and has a high popularity in the TV station. However, such a beautiful and confident girl is caught in an unethical relationship with her senior Lee Dong-jin (Lee Seo-jin) and cannot extricate herself. She is sad every day for this man who is not worthy of her efforts, and often complains to Kang Junsu about this. Seeing Kim Hyun-woo's pain and sadness, Kang Junsu felt very uncomfortable.