죽여버리겠어 - why "여" not "어" I recently saw a moie when someone said 죽여버리겠어 I know the grammar 아/어/여 버리다 but I thought 여 is only connected with 하다 to make "해". Why is there 여 after verb? I thought it should be "죽어버리겠어" Thank you in advance for helping