sazakame's manga / #Reencounter(42)

Guys who got drunk and kissed during military service meet later while working. Poor communication skills between the two have them both making stupid assumptions about each other.

Two guys find out thier BFs are fucking around with each other. One gets violent and leaves the country after the breakup the other leads a mediocre life as an architect. The one that left comes back a decade later as a successful golfer and the ex's also return to cause more mayhem.