Once (KaiSoo)

[COMPLETED] Do Kyungsoo and Kim Jongin were happily marriedㅡuntil Jung Soojung entered the picture. Kyungsoo was pregnant that time and Soojung was, too. But Jongin chose Soojung over Kyungsoo. Jongin left Kyungsoo for her but Kyungsoo did everything for him to stay but it doesn't make sense to Jongin anymore. Silly...