The Secret: Threesome With Friends

The house where his co-worker and his wife live together.

One day, a man’s older brother announces that he will quit his job and start a new business. His family suggested that it would be a good idea for him to cool off and at least go on a trip. As a result, four family members traveled to Korea and are indebted to the older brother’s co-worker, Do-yoon, their local acquaintance during the trip. After that, Do-yoon goes to Japan, and the older brother suggests that he stay at his house together with his wife.