Helpp

so when i first started using mangago i didnt know how to bookmark or add anything to my reading list and i just remembered a manga i used to read and its kinda dumb but i just wanna know the end of it so its about this guy he has a fiance and he has a adopted little sister who he used to have a crush on and he tried kissing her or something and his parents made him go to a military place i think and then years later he comes back and NOW he has a fiance and him and his sister and parents meet up and im pretty sure his sisters name in hyenna or henna and she has a boyfriend i think and they went on some vacation together with her brother and her boyfriend and some other people i thinkk BUTTTT UM I WANT TO KNOW WHAT THE PLOT WAS ABOUT SOOO if you have any idea what im talking about pls reply