2014, the year of the horse, four men of the Kang family all receive a text message.

The four guys all hit rock bottom. But each meets someone or finds a way to get out of the slump.

Only one out of the four will meet someone special. However, all four guys begin their journey.

When Kwang-soo runs into his ex, Jin-goo decides to confess his feelings before it's too late.

After the kiss, Jin-goo, who gets slapped by Sea-young, pours out everything he has been holding in.

Kwang-soo reminisces all the memories with Da-in to find what caused the breakup ten years ago.