I actually started this by season 3, cause it says it's the best one, and in comparison with this one, s03 is really better. This one is dark&bitter.

Episode one: Stamina Tomboy tries to fix her age crises & need the wrong way
Episode two: Age gap. Nice boss, Nice employee, Nice relationship.
Episode three: Flexibility&her relationships, bitter ending
Episode four: Youngsters goes Halloween, she changes but still herself.

The pace here is faster but not in a good way, felt senseless in many moments. Episode two and four has some slight fluffy vibe while episode one and three has more subtle meaning, both FL has unhealthy mindset towards romance: at ep 01: She goes to skinship when she's troubled with something instead of deal with it. ep 03: She adapts too much when in a relationship, losing her friends and her sense of herself.

I suggest do what I did, start by season 3, their stories are a better warm up for this ones. Overall the production, OST and acting are still good here, just the mood is different.