Family drama, cant remember the year. The latter part of the drama was the main leads are happily married and there is a stalker girl that kidnapped the female lead (she is pregnant)  and she was all along under the basement of their own home. The stalker girl started working in the male lead company as a secretary and has a child that has the same name with the male lead please please help

That sounds creepy. Hope you find name.

That was my first thought but there isn't a kid in the first version of it (is there in the second?) and kidnapper doesn't keep FL in the basement, in the '1st' season.

Could it be Phoenix 2020 ? In this drama I remember the FL getting kidnapped and was under her own home the whole time.