Orphan Ah Young is a financially struggling 23-year-old who takes care of her 8-year-old sister Dan Bi while juggling part-time jobs. One day a 28-year-old man Yoo Sang appears in front of Ah Young offering to be her dad through a signed agreement.

• Lee Hyun-joo
• Choi Kyung-hoon
• Lee A Ra
• Min Se Woong
• Kwon Hae Woo