Four characters, whose ages all end with 'nine' go through different challenges in love.
에피소드 1
Episode 1
2014, the year of the horse, four men of the Kang family all receive a text message.
에피소드 2
Episode 2
The four guys all hit rock bottom. But each meets someone or finds a way to get out of the slump.
에피소드 3
Episode 3
Only one out of the four will meet someone special. However, all four guys begin their journey.
에피소드 4
Episode 4
When Kwang-soo runs into his ex, Jin-goo decides to confess his feelings before it's too late.
에피소드 5
Episode 5
After the kiss, Jin-goo, who gets slapped by Sea-young, pours out everything he has been holding in.
에피소드 6
Episode 6
Kwang-soo reminisces all the memories with Da-in to find what caused the breakup ten years ago.
Oh Jung-se
Kim Young-kwang
Yook Sung-Jae
Choi Ro-woon
Yoo Hak-chan
Bae Kyeongsuk
Park Yumi