The earlier parts were casual and normal but after that time skip of 1 year in episode 70 everything shifted and changed for the worse. The reason for the time skip is because the writer put herself in a corner she couldn't escape, she hit a massive wall and couldn't solve it with a radical unexplainable forced time-skip. Right from beginning of episode 70 before the skip, relationships suddenly and abruptly changed within the span of an episode. Afterwards, the female lead suddenly got extremely quit and could only whisper for the remainder of the drama. Young Kwang became completely useless and ruined his character, the writer did him dirty after the skip. Anyway, it's not like it was much better before the skip but still not as bad. Side stories sucked too.