- Drama: Knock on the Happiness Door
- Country: China
- Episodes: 44
- Aired: Aug 12, 2020 - Sep 4, 2020
- Aired On: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday
- Original Network: iQiyi, JSTV, Tencent Video, Youku, ZJTV
- Duration: 45 min.
- Genres: Romance, Life
- Tags: Police Officer Female Lead, Age Gap [Drama Life], Age Gap [Real Life], Doctor Male Lead, Older Man/Younger Woman
- Content Rating: 15+ - Teens 15 or older
- Score: 7.3 (scored by 219 users)
- Ranked: #7417
- Popularity: #8732
- Watchers: 908
- Favorites: 0
