looking for a drama 2

Hi everyone,

I am looking for a drama, I can remember bits from it and I want to watch this again.

The male character travels back in time and meets his mother who is working at the bank or stock market, selling something similar.I remember that to be hired there he gets the right stock figures
at some point, he falls in love with his mother's friend and he is about to disappear when his mother almost loses him in her belly. he was wearing a suit famous brand and when he was in the past he tried to fix this with the same tailor.
When he returns to the future he is looking for his girlfriend and they meet each other in a school.

hope are enough details  :) :) thnak you in advance

operation proposal  is a good drama unfortunately is not what i am lookingfor:(

This is the series thank you very much i was looking for it for a long time i am not sure why is not on the time travel dramas list .thank you ,thank you,thank you