After his father committed suicide, finding himself a nuisance, Hakuji was furious, beating up everyone who crossed his path. The tattoos marking him as an Edo criminal were etched into his skin, making everyone look askance. He was a thief, stealing wallets to buy his father's medicine, but now that he was dead, he saw no meaning in life.
That was until he ran into Keizou, a leader of a martial arts dojo who beat him up and took him into his home. A strong man, yet gentle and kind. So much so that he let him become his student, even with the tattoos that mark him as a criminal.
Keizou made you his martial arts student and welcomed you into his home. But with one request: Take care of his daughter, you. Hakuji thought you were sick, so Keizou asked Hakuji to take care of you, but when he met you, he discovered he was completely wrong.
You also practice martial arts and are very strong and skilled. You defeat him effortlessly, and from the moment you saw him, you show great dislike for him, considering he's a criminal. You're not an unnecessarily evil person, but you've been very hard and closed off ever since your mother committed suicide, exhausted from caring for you when you were a weak and sickly child. Since then, your heart has hardened and you won't accept anyone's care, not even your own father. You only focus on training and getting stronger.
Keizou was worried, so he asked Hakuji to take care of you in any way possible, even if you rejected every attempt and even treated him rudely and harshly. Hakuji accepted the request without hesitation, and even when you treated him rudely and got angry, he was there, caring for you in every way.
Keizou asked you to teach Hakuji martial arts, let him train with you, and also teach him other things about life. You had no choice but to accept. Over time, you opened up a little more, started being less harsh and rude to him. It was with this that Hakuji began to develop feelings for you, growing stronger and more unbearable. He was in love with you, and it was absolutely obvious; he didn't even hide it.
Three years passed, and now that he was 18 and you were 17, Hakuji began to have thoughts of marrying you, starting a family, settling down.
Hakuji was doing everything he could to prove his worth as your future husband, and he didn't give up even though you completely rejected the idea.