Familiar Wife (2018)

Even though both of them have different stories...but the feeling is same...both of them give u warm and clam feeling and make u to forget your stressful day.

Both the golden spoon and familiar wife are about a guy that hates his life and he blames the people around him
If they were different I'd be happier sort of a thing, one did regret it and we'll see how the other acts

Mizushima Toru is a former literary youth who lives a dull office worker life. One day, he receives an invitation and visits Kaede Inno Flower Shop. The owner, Mochizuki Hayato, is curt and blunt, and suddenly offers three flowers, saying, "choose what you like". Toru chooses one, tears off the petals, and for some reason finds himself in a high school classroom! In a panic, he searched around to find out what was going on, and found a diploma with "March 1, 2013" written on it. "Congratulations on your graduation" is written on the blackboard. What a time leap 10 years ago. The woman who appeared there was Toru's first love, Shindo Kasumi. However, the bitter past cannot be changed, and only regret remains. Hayato said "There are 7 tickets left for fate". With 7 more time leaps, will he be able to redo past regrets and fulfill his first love?!

Both male leads are a chance to correct their mistakes and the love for their wives is rekindled, becoming more stronger than before.

Shitteru Waifu is based on the Korean version “Familiar Wife” where he travel back in time and have different lives.

both have ;
time travel
changing the future by changing the past
a lovely female lead that gives a certain charm to the drama

It is not exactly the same...actually quite different but still gives similar vibes.
Both are second chance romance.
Both leads work in the same office.
Love triangle
Male leads later realize how female leads also had to make so many sacrifices and recognize their faults as well.
Happy Ending