Ultrabenosaurus, what's wrong with you? The MC decided to marry off a man to lead a happy life, so she ran off from the palace and seduced a man. Sadly, she even mistook him for another person. But it was her plan from the start to sleep with the guy, and she was playing shy and reluctant, because it's Asian work, and females in webtoons like that can't come off as whores, u know. She may have panicked she seduced the wrong man, but she actually was quite gratified with ml bed skills.
Just stop flagging everything as rape or whatsoever. If you don't feel Asian content is appropriate, just don't read it, duh.