The story revolves around four friends who decide to get back to studies, after a gap of fourteen years. But, what happens when four of them unravel a mystery which was underneath for long time?

Four college seniors open a bogus sex clinic, which unexpectedly mushrooms into a multi-million dollar business.

Four college seniors open a bogus sex clinic, which unexpectedly mushrooms into a multi-million dollar business.

A biomechanical fusion between Marlene, a secretary who has been working for thirty years, and the x3000 model printer, will give rise to a new generation of workers: the senior 3000. The revolution in the world of work is underway!

Unlike Seok-ho, who is happy to meet you, Jeong-hun is uneasy about Su-jin's wife, Sujin. This is because he liked Sujin in the past but couldn't confess because of his seniors. A few days later, Jeong-hun and Su-jin visited the house at the invitation of a senior and reunited after a long absence. They talk alone to confirm their feelings for each other and to share their hot love affairs...