My Mister 나의 아저씨
- Lee Sun-kyun as Park Dong-hoon
- The second oldest of the three brothers. He works as an engineer at an architectural firm and always has a safety-first approach to life. He is quiet and stoic, but also goes all in for the people he loves.
- 아이유 IU Lee Ji-eun as Lee Ji-an
- A woman who is enduring many hardships in life. She is tasked with finding out Park Dong-hoon's weaknesses at the command of her boss, who runs a company she is temporarily working for, but soon ends up falling for his warm charms and learns to trust someone for the first time.
A man (Lee Sun-Kyun) in his 40's withstands the weight of life. A woman (IU) in her 20's goes through different experiences, but also withstands the weight of her life. The man and woman get together to help each other.