It started with very good two episodes or so that's it then it became just normal crush from a teenage kid with sad past and good teacher that helped him overcome his grief then it became an obsession from the student towards the teacher then it backfired on them both ,, the teacher didn't do anything wrong , may be she overlooked the obsession that the kid developed towards her because she liked his mathematical brain ,,, then the drama suddenly jumped four years into future and the kid became adult so now he's allowed to love his teacher ,, he couldn't find her so he became a teacher himself to avenge her from the people that wronged her , ,,, of course that's not smart at all from math Genius then he find his teacher is doing the same but from far hahaha then he started chasing her again ,, they went round and round each other with no affair or love scenes or any actual romance it became dull and very boring turned into revenge plot that is failing too
By the way ,, the first few episodes they tried to make math fun and enjoyable to learn but the writer lost his IQ on the way didn't mention math or did any smart moves after that hahaha
so after 13 episodes all we got is a very annoying characters who are very bad towards each other and two main leads who are lost and trying to get back at the bad people but failing miserably that's it
You won't get anything from this drama but what i've said above
good luck