Nine Times Time Travel (2023)

Both are short length dramas in which the leads are classmates and right when one is about to confess, the other dies tragically. The remaining lead discovers some objects left behind (photos vs. candles) can be burned, allowing them to travel back in time for a little while each time. They then try to change the past and save the person they love.

The film mainly tells the story of childhood sweethearts Gu Yu Xuan and Han Shu Yan who met and fell in love again after many years, but an accident caused them to fall into a cycle of time and space, and their fate was rewritten accordingly

Both are short length dramas in which the leads are classmates and right when one is about to confess, the other dies tragically. The remaining lead discovers some objects left behind (photos vs. candles) can be burned, allowing them to travel back in time for a little while each time. They then try to change the past and save the person they love.

Of course same tittle
Same time travel
Same saving of lives and changing destiny
One of my favorite kdrama of all time.

The ML is the one who travels 9 times with the use of incense instead of candle .
At first I thought it was a remake

Both dramas are about one of the leads suddenly dying and the other time traveling back to the past in an effort to save their life.

Chinese drama used a candle to travel back in time and here in kdrama female lead used recorded music tape.