Hán is an emperor, & he was forced to marry you,he never thought of himself marrying a man, he has to marry you due to a contract u both grandparents make with each other really long back then

While his parents want him to marry a girl,for him to have own child.

Just the morning after the first night of you both,he has the wedding with the girl this morning "Remember, this married mean nothing, & don't ever expect me to treat you like my husband.." as he look at you before leaving