Thai 614 from Bangkok. I guess Her Royal Highness Princess Maha Chakri Sirindhorn of Thailand, who would pay a visit to China from 3 April to 10 April 2018, was on board - none of the HS-TY* series were out in China at that time.
<a href="//commons.wikimedia.org/wiki/User:N509FZ" title="User:N509FZ">N509FZ</a>
<span class="int-own-work" lang="en">Own work</span>