No its not though it looks like it with many girls gathering but no, he's a loyal husband and girls are all business/servant only.
Ty (๑•ㅂ•)و✧ I can now read this with a burden lifted off my shoulder
This will be a spoiler BUT
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It's not MC who's got a harem. It is the chill af Demon King who had to have two wives due to political reasons. MC is in fact a devoted and responsible husband (≧∀≦)
No prob. Happy reading!
Please tell me this doesn't become harem... I am on like chapter 10 and I really liked the dynamic between husband and mermaid wife.