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I can smell the love triangle... his coworker is probably gay and put the wedding ring on to seem like he has a girlfriend at work ... MC will probably find this out after he decides to give his sister's friend a chance and it will sway his emotions... it will probably be a rollercoster until he finally ends up with the sister's friend ┗( T﹏T )┛
But this 60 chapters is long for a misunderstanding / miscommunication.