only starting is good

I truly liked the starting but when the female lead entered in the company with her sister's name from then I didn't really liked cause the story was not that good from then cause if you are using someone's name then you should know about the company and about that person and be prepared but she was not so it did feel like she is investigating and the male lead acting was good in the starting but in the company he lost that vibe ?you can watch but it's a one time drama
rewatch?( personal opinion )