The trailer makes it very much obvious that both the main leads are going to have feelings for each other (though…
The feelings will be there (the umbrella scene, him being jealous because she has a crush on her senior etc. are some of the usual tropes of kdrama hinting towards them being romantically involved) but they might not act upon them till she achieves her goal (last ep) . I think they are going to go with "slight romance".
The trailer makes it very much obvious that both the main leads are going to have feelings for each other (though they may not end up dating each other until the very last moment) and the other guy is your usual second male lead of kdramas the fl initially would have a crush on him but he won't be the end game.