I had to search deep into my reading list but I'm pretty sure it's this https://www.mangago.me/read-manga/the_strongest_characters_in_the_world_are_obsessed_with_me_bored_corona_kids_version/
https://www.mangago.me/read-manga/the_strongest_characters_in_the_world_are_obsessed_with_me_bored_corona_kids_version/
Had to search deep into my reading list but I think it's this
Yes!!! it is thank you so so much!! (๑•ㅂ•)و✧ may your pillow be cold all throughout the night when you sleep. <3 (Adding it to my reading list now too)
What i remember is that i think its about a group of guys swooning over one girl cliche and the fl becomes the younger sister of one of the guys. He has white long hair and so does the fl and before she came to this world the dude didnt have a younger sister. The thing is the main group of guys are powerful and have magic or something and as they get older the magic becomes stronger and there's a chance of them going berserk and destroying everything in their path. The fl doesn't want to die so she tries to be close with her brother and eventually we the readers find out she has the power to calm them down somehow. Cuz one of the side characters, a woman (she has brown hair and hides her face or arms becuz she has a scar), who also has strong magic goes berserk but the fl is able to calm her down and saves her. The older brother of the fl is also known to be cold and stuff but from what i remember they do grow close as siblings. Pretty sure they arent endgame tho. The last thing i remember is that the fl gains the interest of the prince/king? (he's a blondie and has red or blue eyes) of their empire as he too has the powerful magic and realizes that he feels calm whenever he shakes hands with the fl. Thats another thing one of his abilities is to tell what people are thinking/feeling by shaking their hands so he constantly tries to shake fls hand. Ive been trying to find it but have failed thanks in advance if anyone figures out the name of it and responds! <3