formal/written: 그러므로; casual: 그래서
therefore, thus, so
Example
운동은 건강에 좋습니다. 그러므로 매일 운동해야 합니다.
Exercise is good for your health. Therefore, you should exercise every day.
Word parts
그러하다 'to be so' + -므로 'because': because it is so.
Good to know
Mostly used in writing, speeches, and essays; in conversation, 그래서 sounds natural.
Related words