I saw the news article here

On 22th May 2019, Hyundai Transys signed contract with Rivian, which is a start-up company of electric cars, for supplying car seats.

The amount of the contract is KRW 1,000,000,000,000(= about USD 840 milion), validity from 2020 to 2027.

About more detail, you can refer to English Version article here : https://en.yna.co.kr/view/AEN20190522003900320