Yona of the Dawn, Vol. 47 by Mizuho Kusanagi

A red-haired princess loses her family and her kingdom… Now she must rise and fight for her throne! Princess Yona lives an ideal life as the only princess of her kingdom. Doted on by her father, the king, and protected by her faithful guard Hak, she cherishes the time spent with the man she loves, Su-won. But everything changes on her 16th birthday when tragedy strikes her family! Hak miraculously reunites with Yona inside the Chalice of the Four Dragons’ Blood! As they search for Jaeha, Gija, and Sinha, who fell into a sea of blood, Su-won draws the attention of the dragon gods from the outside world. But how feasible is it for everyone to get out of the chalice alive?