Within minutes of The Untamed airing, historical suspense drama The Longest Day in Chang’an 长安十二时辰 released twelve episodes without any warning. You can watch it here (update: now region-blocked; update 2: it will be up on Amazon, Youtube and Viki sometimes in July). Only the first four episodes are available for non-VIP members. I’m not sure when/if the rest will be available for non-VIP members.
Li Mi (Yi Yangqianxi) is the head of Chang’an’s anti-terror department, and is tasked with investigating a group of mysterious Turks who have infiltrated the city. Zhang Xiaojing (Lei Jiayin) is a former imperial army officer turned buliangren (constable) who is currently in prison after breaking the law, though is set free because Li Mi believes he is the only person who can solve the mystery.
Zhang Xiaojing’s familiarity with the city’s alleyways and the habits of the Turks leads him to the conclusion that their ultimate goal is to create havoc during the Lantern Festival. Wth less than a day left before the event, the two must race against time to protect the capital and its people.