since comingUsed in the pattern 온 지 얼마 되다 or 온 지 [time] 되다 to say how long it has been since someone came or arrived. 온 지 얼마 안 되다 means "it hasn't been long since [someone] came."
KO: 한국에 온 지 벌써 일 년이 됐어요.
EN: It's already been a year since I came to Korea.