-아/어서 gives the reason or the step before descending: 이제 무서워서 내려갈래 'I'm scared now, I want to go down', 우회전해서 내려가야 돼 'turn right and head down'. Note that 내려가다 also means travelling from Seoul out to somewhere further south — 마산에 촬영이 있어서 내려갔었는데 'I went down to Masan for a shoot' — and, of figures, dropping: 땡겨서 내려가는데 'it gets pulled down'.