Alicia is pretty traditional. She considers flowers and pretty gifts romantic, candle-lit dinners etc. She also considers Prince Charming type chivalry romantic, but she more or less had to become numb to that because Kattar always showed her that without showing any romantic interest in her, so it would be weird to read into his actions.
Her romantic daydream would be a date night going to see a play on a warm summer night, walking home late under a starry sky (her sweetheart is in a wheelchair though, because a long walk would be a struggle for him) to go home and be cuddly.
Since her sweetheart doesn't like going out in public very much though, and he can't even imagine how you'd navigate an auditorium in a wheelchair, his romantic daydream is extremely different.
Jinwoo considers most of the same things as Alicia romantic because he's obsessed with fairy tales, but also slow dancing. His romantic daydream would be him and his crush as characters in a fairy tale, but if forced to ground it somewhat in reality, it would be basically the same, but in modern day clothes. The two of them slow dancing in the dark.
https://tapas.io/episode/3091518