It's BL manhwa about the couple who goes 14 years or more so and then the ML cheat and then the MC died because of cancer and meet the handsome doctor (I think) before the MC died he know the ML infidelity but the ML took the MC for granted because he thought the MC will love him forever and never leave him. I see some update (but it's missing from my subscription) that the MC goes back to the past with ML and the story become crematorium chase MC back
I remember I drop out this around thirty five-six because my logic can't accepted a soldier betray just because the family and disobeyed their superior just because they're cadet like justice etc. And here I am still read it until the end. Fck