You have to do it in person.
 →  직접해야해.

[예문]
 ※ in person

1.직접, 몸소
You can't buy this online;you have to do it in person.
  이건온라인에서 못사,직접사야해.

2.실제로, 실물로
I've talked to him in chat rooms, but we've never met in person.
난 그사람이랑 채팅만했지, 실제로 만나지는 못했어.