Proposal Daisakusen (2007)

The male lead gains ability to repeatedly go back in time to 'correct' certain situations so they can grab a hold of the heart of a girl they are interested in

in both drama there is the actor Yama P. Also in both drama there is a "god" who will help the love story between the protagonists.

This take is a fast forward a year after the end of the drama.

On her 17th birthday, Ozaki Karin suddenly lost her childhood friend and first love, Soma Jun. Ten years later, on her 27th birthday, Karin happens to find a film camera left behind by Jun and the photos he took of her. This causes her to remember all the feelings she had for Jun. Unable to control her emotions, Karin burns all the photos and is transported back in time to the day the photo was taken 10 years ago. As Karin travels back and forth between the past and present to stop Jun's suicide, she slowly discovers the shocking truth behind her childhood friend's death.

These guys are all trying to get together with a girl and get married

Both have marriage as the end goal. Also Yamapi stars in both :)

Operation Proposal è il remake coreano del drama giapponese Proposal Daisakusen. Nonostante la storia di base sia la stessa, i due drama differiscono in molti punti.

Let's not forget the original Japanese drama starring Tomohisa Yamashita.
Time travel - romance - comedy

both male protagonists manage to go back in time to win their first love----------------------------------------

It's about time traveling to get the one you love through old photos that taken in the past.
But Proposal Daisakusen is a romantic comedy, so the story is more entertaining. However both drama bring a meaningful message about love and how important to appreciate and protect the person that you love.

Miyu and Shuya are high school students. They have dated for 2 years. Miyu and Shuya have a promise that no matter what, they will watch a movie together on the first day of each new month. When Miyu and Shuya are on their way to the movie theater, Shuya suddenly cancels their date. Shuya seems like he is hiding something and he acts nervous. Later, Miyu goes to the place where she is supposed to meet Shuya, but she witnesses Shuya getting into a car accident. She panics, but when she wakes up she finds herself on the morning of the accident. Miyu keeps waking up on the day when Shuya got into an accident. ~~ Adapted from the novel "Kimi ga Otoshita Aozora" by Sakura Eeyo.

Yoshiyama Mihane is a 3rd-grade high school student. She is a member of the photo club at her school. The day before her summer vacation, she smells a lavender scent in the science lab and she suddenly gains the ability to leap through time. Fukamachi Shohei is Mihane’s classmate. He actually came from the year 2122 and is a researcher. Shohei lost a drug that allows him to go back to 2122. In the meantime, Shohei hypnotizes those around him and lives as a high school student. However, as time goes by, Mihane and Shohei start to have feelings for each other.

It's technically the exact same story, just this time instead of getting the girl, the lead fumbles and gets the guy.

In both dramas you travel to the past through photographs in order to conquer your first love.......

Both stories are about bestfriends staying as bestfriends because they are afraid to lose each other if they were to tell the truth that what they feel for each other is actually love.