Silla Annexes Geumgwan Gaya
King Guhae of Geumgwan Gaya surrendered his kingdom to Silla, which extended its reach over the lower Nakdong.

HappyMidnight · CC BY-SA 4.0 · Source
Geumgwan Gaya at Gimhae had led the early Gaya confederacy through iron and sea trade, but it never recovered from Gwanggaeto’s campaign to the lower Nakdong in 400, and leadership passed to Daegaya at Goryeong. In the 6th century Silla, strengthened by King Beopheung’s law code and adoption of Buddhism, pressed toward the Nakdong.
In 532 King Guhae (Kim Gu-hae) surrendered with his queen and three sons. Beopheung gave him high rank and his former kingdom as a fief, and the royal family entered Silla’s jingol aristocracy. Guhae’s son Kim Mu-ryeok was the general whose men killed King Seong of Baekje at Gwansan Fortress, and his great-grandson was Kim Yu-sin, who led the unification wars.
The lower Nakdong and its sea lanes gave Silla a foothold for advancing into Gaya. The remaining Gaya states fell to Silla with Daegaya in 562.