The latest plot development in the TV series "The Last Immortal" can be described as truly heart-wrenching. In the previous storyline, in search of the Three Lives Stone, Ayin and Gu Jin ventured into the mortal realm. After a fierce battle with an evil dragon, Ayin and Gu Jin's master-servant contract was broken. Later, at the request of the Three Lives Stone, these two pretended to be a married couple for a day, which was supposed to be sweet. However, this segment was still criticized as immature.

The audience's thoughts are surprisingly similar: it's too childish. Moreover, considering their age, Gu Jin is old enough to be Ayin's ancestor, making their relationship as a grandparent and grandchild difficult to accept. Ayin is newly hatched, so her naivety is somewhat understandable, but Gu Jin is clearly hundreds of years old. Yet, at the beginning, he gambles with others, even losing two hundred years of cultivation. Despite being hundreds of years old, he behaves childishly.

Their subsequent marriage was also criticized for lacking any couple chemistry. Furthermore, there is no shyness or meaningful eye contact on Gu Jin's face, which is somewhat disappointing. While he can be considered old due to his age, he lacks worldly experience and acts like a child throughout. On the other hand, Ayin's pure and adorable nature is portrayed vividly.

The second reason for criticism is his poor acting skills. He remains expressionless throughout, like a block of wood, with the same facial expression and a cold demeanor. There's no emotional fluctuation in his tone or expression, giving off an extremely calm and composed vibe. This is in stark contrast to Ayin's spirited and mischievous character, as well as the slightly wicked Hong Yi and the passionate and decisive Yan Shuang. Even when compared to characters like Xiu Yan, the Ghost Lord, and Ghost King Ao Ge, who have a cold and ruthless persona, he falls short.

The most evident flaw is the lack of variation in facial expressions and tone before and after the emotional scenes. It's as if they are identical, and he can even maintain a calm demeanor when angry. It truly leaves one speechless.

It can only be said that the male lead was miscast. Therefore, despite Gu Jin's character not being inferior to others, he is still criticized. The marriage is condemned, and there is no change in facial expressions and tone before and after emotional scenes. It's no wonder the drama "The Last Immortal" received harsh criticism, as it proves how crucial it is to choose the right male lead.