When Zhang Mingliang was preparing for his wedding room, he broke the wall while moving things, revealing a small hole. After marrying his wife Bai Jing, he repaired the hole many times but to no avail, so it was gradually ignored. Later, the hole followed their ups and downs from a couple to a happy family of three, from poverty to wealth, and later accompanied the comings and goings of different tenants. It is like a lens that records the joys and sorrows of multiple families, whether happy or sad. From the wedding of Zhang Mingliang and Bai Jing to their divorce, the hole in the wall has never really "healed". It stays quietly on the wall, guarding the people living here, silently observing their lives, as if using its own "incompleteness" to remind everyone in this house how they should face life, family, lover, and children...