Junhui, who stuck with his parents rules to promise him to the family he is told off to marry their child, includes to perform an Unbreakable Vow over the relationship, feelings and marriage.

 Yet he is madly in love with a senior of his from his Wizardry school. A pureblood Hufflepuff, stuck with a Gryffindor (he just about to know his partner existence is in the same school as he is in), and is (about to) promised his whole life and soul to the other.

 A journey of Jun accepting his fate or more like he prefers this for eternity, rather than his own choices of partner for life.