Oppo K9 5G is all set to launch in China on May 6. The phone is teased to come with a 3D liquid cooling system and will feature an OLED display with 90Hz screen refresh rate. The phone is listed to have an under screen fingerprint sensor.

source https://gadgets.ndtv.com/mobiles/news/oppo-k9-5g-specifications-listed-official-site-snapdragon-768g-soc-65w-fast-charging-support-2422791#rss-gadgets-all