The Fallen duke and the knight who hated him (manhwa)

Haven't seen anyone post this manhwa here yet so I decided to do it myself. This is a bl shounen ai novel and it's about the duke (luisen) who regresses after dying of sickness after he fled the war and tries to correct his mistakes. While the royal troops and mercenaries, one of which was carlton the ml, were marching in on his territory he decided to flee because he was scared. After fleeing he lived as a beggar till he was found by a monk who took care of him until he died. In his new life he refuses to flee and waves the white flag in front of carlton. This story is mostly funny and lighthearted but it gets dark at times. Carlton is a meanie at first but after a few chapters he develops a soft spot for luisen and becomes really sweet. It's a really good novel and the manhwa is also a good adaptation you guys should check it out