A. 곧이어 B (곧이어 ~이/가 시작되었습니다)
right after, immediately following, shortly after
Example
개회식이 끝나고 곧이어 첫 경기가 시작되었습니다.
The opening ceremony ended, and the first game started right after.
Word parts
곧 'soon' + 이어 'continuing' (from 잇다 'to connect').
Good to know
Pronounced [고디어]: no palatalization here, because 이어 is a full word, not a suffix.
Related words