Xiyue Is the Witness: Master-Disciple Love Will Be Doomed Early

I am Xuan Chen's close disciple, and I have been secretly admiring him for five years. When I saw the engagement letter between him and Princess Penglai, he only said to me, "There is a difference between master and disciple, and you must abide by your duty." He wants to marry someone else, so what does the transgressive tenderness between us count?