Pretty sure that the prince doesn't actually have feelings for the concubine considering she brainwashed him, but that doesn't necessarily mean that he had feelings for FL because it's hinted that FL was the one who primarily wanted this marriage. Only time will tell
Ok I'm gonna comment a few thing.
1. Why male starting to looking more girly?
(it's not a bad thing)
2. The prince is a m or what?
3. Do the prince really like the concubine?