Marvel, Enemies of Mutants

Link traveled to the Marvel world and was locked up with Tony Stark. He was a little panicked at first, but the awakening system allowed him to see the light. However, Link discovers that his identity is shrouded in mystery. A seemingly ordinary person has marksmanship and skills that surpass those of special forces. The life experience of the mysterious girlfriend who is said by his friends to be very controlling has become confusing. It wasn't until Link returned home that he saw the diary he had written. The diary was very simple, with only one sentence, but it made Link's hair stand on end. "Do not approach any mutant until you have the ability to kill them all. This will bring misfortune to you."