Read manga: Doubt (Nishimura Shuuko)

manga
Summary:

Five men gathered in the mountains to conduct a survey. There, Misaki meets Yanagida, who looks like his missing lover Kousaka. But with no memories of the past, can Yanagida really be the man Misaki used to love!? A notice of personal change cutting the team down to four als arises the possibility of there being a spy! Plagued by doubts, who do these men truly love? And who is the real spy?