Strongest Fighter manga summary:
A new transfer student, Tae Yeob, on his first day in an all-boys school (though it is enticingly close to an all-girls school), stutters through introducing himself. He’s awkward at first, but the other boys’ snickering stops when he says with sudden calm, “My hobby is fighting. My goal for the future is to become an MMA fighter. I plan on crushing all this school’s fighters by next week.”
After collecting information about the various personalities and fighting styles of the top fighters in the school, he’s ready to make good on his word. Ssen Nom, The Strongest Fighter, is an earlier work of the manhwaga of the God of Highschool, and it shows its lineage in bruises and blood!