. . . . . . . . . . . . . . . . According to the spoilers I read, Captain is shocked because Roel was allegedly a man and two men can't get married (in their world). When Roel clears it up for him, he accepts it and loves her regardless.
When you find a content posted by another user as interesting, you can click on the "♥Like" button to save it. You can easily find these saved contents in your Favorites list.
Spoiler ahead