kebetulan

[ke·be·tu·lan]nounadverb

Definitions

1.
coincidence
Derived from "betul" (correct/true) via ke-...-an circumfix. The semantic shift is from "correctness" → "something that happens to be right/fitting" → "coincidence"
2.
coincidentally, as it happens, by chance
Used as an adverb at the start of a sentence to mean "it just so happens that..."
Kebetulan di belakang gue itu lapak caturnya, dan sebelahnya rame banget. Ada apa tuh?
It just so happens that behind me is the chess spot, and next to it it's really crowded. What's going on over there?
— YouTube — https://youtu.be/Lu6KWCkX17k?t=44