Become a Moon Elder to Cultivate Immortality

His cultivation of immortality is different from others. He only needs to complete the marriage to achieve the level that others can achieve after decades of cultivation. Becoming a fairy seems to be just around the corner, but marriage does not seem to be so easy to achieve. How can an otaku with low self-esteem be with a goddess? How can monsters fall in love with mortals? ... Please, can we have a normal relationship?