A couple, Jung Hee-tae (Uhm Tae-woong) and Kim Il-ri (Lee Si-young), meet again after seven years following their first encounter as student and substitute teacher.
They fall in love and get married and live the perfect life, until it is disrupted by the appearance of Kim Joon (Lee Soo-hyuk) who starts working with Il-ri and falls for her.
| Also Known As: | Sensible Love, Valid Love |
| Directed by: | Han Ji-seung |
| Written by: | Kim Do-woo |
| Starring: | Uhm Tae-woong, Lee Si-young, Lee Soo-hyuk |
| Original network: | tvN |
| Original release: | 1 December 2014 –3 February 2015 |
| No. of episodes: | 20 |
| Executive producer(s): | Kim Young-kyu |
| Producer(s): | Kim Kwang-il Kim Ryun-hee |
| Production Company(s): | KPAX |
| Source: | tvN |
