A love observation program that combines reasoning and sweet romance. 9 single young men and women from all walks of life and different identities are selected to live together for 15 days. The program will reconstruct some life and social scenarios, and try to draft a social guide for young adults through the 15-days of filming. In the program, there is 2 roles, guests with the lovers roles and guests with X lovers role. "X Lover" is hiding among the guests. Each episode there will have a proposition regarding the "X Lover". The love detectives will need to observe the behavior of the guests and integrate it to their own experiences to give their own deductions. The person who got it right each episode are given the "Wisdom Badge", and the love detective who accumulates the most badges throughout the season will receive a mysterious gift.