Lee Hyun-yin plays Lim Soon, a public intern in her 50s during the day, and Lee Meizhen (played by Jung Eun-ji), a 20-something job preparer at night.

Choi Jin Hyuk plays Ji Ji Xiong, a drug investigation prosecutor who is entangled with two women, Lin Shun and Li Meizhen.

The play is a whimsical and sweet romantic comedy about a job-preparing student who is suddenly trapped in old age one day and a prosecutor with her abilities who is confused by her day and night.