In which episode of Nirvana in Fire, did Wang Jing know the identity of Mei?

Jing Wang and Mei are the 49th episode, knowing that Mei is Lin Shu.

Xia Jiang entered the palace late at night and told Liang Wudi everything he knew. Imperial academy also found records related to fire, cold and poison. Emperor Liang was very suspicious of Mei's identity, so Emperor Liang ordered to write a letter to Prince Jingyan and let him enter the palace.

Jingyan hurried to Yangju Temple, and Emperor Liang summoned Xia Jiang to the front of the temple. Emperor Liang ordered Xia Jiang to know everything, and Xia Jiang went to the door to identify Mei as the rebellious Red Flame Army rumbled Lin Shu. Jing Yan listened in surprise, while Mei Su Chang remained calm.

Long before the conspiracy, King Jing doubted Mei's identity. In the back tunnel, Liu Fei undoubtedly told him that King Jing was joking about "Buffalo", which made King Jing suspicious, because the story of "Buffalo" was only known by himself, Lin Shu and Princess Ni, and "Xiang Di Ji" also aroused King Jing's speculation. However, Mei tried to cover up the fact that she was Lin Shu in front of King Jing.

Began to doubt identity: episode 43

Mei Su Chang followed King Jing to see Fei Jing. Fei Jing studied May Su Chang carefully. When she poured tea for her, she knocked over the teacup on purpose and got May's clothes wet. She took the opportunity to look for traces on Xiao Shu's arm, but found nothing. Fei Jing asked to feel May Su Chang's pulse on the grounds that she wanted to see more cases. After discovering her symptoms, she couldn't help but swear.

Fei Jing forced Wang Jing to leave the account, and finally could not control his emotions and burst into tears. May Su Chang is not sad, but she still encourages Fei Jing not to worry about herself.

Wang Jing couldn't help asking May Su Chang if she had any secrets about Fei Jing. Fei Jing has just told Wang Jing that she was saved by May Su Chang's father when she was young. May Su Chang gave Nie Feng the last pill, but he relapsed.

Fei Jing came to treat May Su Chang. Wang Jing was uneasy and heard Mei Su Chang talking to herself in the chaos: "Jing Yan, don't be afraid."