(on Chai)

Dainsleif and Kaeya were born in Khaenri'ah which was destroyed by Gods and Archons 500 years ago and that time, Kaeya and Dainsleif were dating

Kaeya now lives in Mondstadt and Dainsleif was also in Mondstadt, Kaeya bumped into Dainsleif in the Knights of Favonius Headquarters

Kaeya almost fell but Dainsleif caught him by the waist