The series is about an incident that takes place when the owners of the boarding house called 'Guest Summer Palace', which breaks stereotypes, and boarders with secrets gather to find Lee Seol who disappeared 13 years ago.

• Shin Ye-eun
• Ryeoun
• Kang Hoon
• Jung Gun-joo
• Han Chae-a
• Hyun Woo
• Oh Man-seok
• Lee Jun-hyeok