A dealer works at the dealing room of Hana Bank headquarters in Seoul, Thursday.

KOSPI closed at 8,185.29, down 43.41 points, or 0.53 percent, from the previous session, while Kosdaq ended at 1,104.36, shedding 28.77 points, or 2.54 percent.

Yonhap The benchmark KOSPI dipped Thursday amid renewed U.S.-Iran tensions but held firm above 8,000 after a record-setting two-session rally that pushed the index beyond 8,200.

KOSPI opened 62.97 points, or 0.77 percent, lower at 8,165.73 and finished the session at 8,185.29, down 43.41 points, or 0.53 percent, from the previous trading day.

The index briefly tumbled to an intraday low of 7,841.01 amid aggressive selling by foreign investors of market heavyweights Samsung Electronics and SK hynix before recouping most of its losses on the back of strong retail buying.