Because both people in the story are in different occupations. The idea of the couple, it is not the same, and in the last episode, the couple did not match, but it was a better matchup might occur later.
Because both the In different professions. The idea of both is the same. And in the end, the couple were not together, but it might be a better matchup later.
Because both of the career is different. The idea of both are different. And at the end of both is not together, but it may be a good friendship up afterwards.