What i like:
Ml doing things without her knowing.
Fl level headed ( in her work),

What i don't like:
I feel the entire plot was unfair, maybe ridiculous for ml. He never had a relationship and was crushing fl for 11 years, accomplished and stable. He was too perfect, that's why itfelt unfair.
And fl had a past relationship for 7yrs, which for this plot adds more unfairness for ml.
And for first 10 to 12 episodes, she was way too selfcentred and emotional rollercoaster.
She wants to hide the relationship, yet couldn't hadle the consequences.
Fought with ml, for a decision he took in his work life.
Never took her relationship seriously ( played safe and secure kindaa).

After that we can see a stable mature romance developing.
The ex of fl and a girl with one side love for ml were never a threat.
One thing to be appreciated was, fl was never influenced by them. She stood firmly by ml side and also aced her work life.