Spoiler:
There is no gangrape . But there will be a threesome in vol2 . And like u asked why did he raped him, u could say ml has tried to kill mc many times and also has happened in an Extreme way. Its a torture rape for mc. ML only had an interest on mc after the threesome but he still doesnt have any feelings or obsession toward mc at that time.
Later on it gets worst and mc’s organisation is betraying mc . That is the reasom why they sent the picture of ml and saying it was his partner. Which ml pretended too.Σ(  ̄□
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And there will be many rape scenes so just skip these scene if u dont like it.bcuz the story has more plot and less romance. ╮( ̄▽ ̄)╭
I heard ab the rape n all but why does the ml abuse mc too? This is way worse than roses n champagne but it’s a Korean bl manhwa after all