A side note:
Zoe is the youngest student of Royal Academy (she's 16 here) who considers herself an unpleasant outcome of her mother's affair, mistreated by her own mother and half-sister. There's no surprise she has a teenage crush on someone who can easily read her "inner melody" (a very tall and handsome someone, we must admit haha). It doesn't mean that there's a big love story between them ahead, but the attitude and blushes are quite reasonable.
Luka isn't blind and noticed Zoe's discomfort, but he is old enough to react calmly and pay no attention to it. Instead, as a teacher he tries to help his student find the right path.