Why change his age to 17 when in the novel he’s 15 ┑(￣Д ￣)┍

U mean his age was 15 throughout the novel?

He regress to 15 and faked his death. He started acting after hiding 2 years. So yes, he is 17

Ohh isnt that the same then? I thought in the novel he would regress back to 15 but with no time skip ( never read novel tho?)