Lyrical: Let go of what is defined to be right and wrong
Lan Zhan says this to his uncle-how do you define what is right and what is wrong? To him, it is wrong to say that what Wei Ying did was wrong, it only depends on your definition of what is wrong and what is right. The literal says that right and wrong are all of the past, but I think more importantly, especially to Lan Zhan, he doesn't want to be bound to the definition of right and wrong anymore since he no longer believes in these definitions.
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Despite his uncle's wishes, Lan Zhan goes to visit Wei Ying. He is no longer bound to what is viewed to be right and wrong, and this is even more prevalent later on.
醒来了 怎能当梦一场
Literal: Since you have awakened, how can one act as if it were just a dream
Lyrical: Once awakened, it is more than just a dream
This part is sung by Wang Yibo, and matches the lyrics later on in the song. Because of this, it can be interpreted that it is Lan Zhan's unwillingness to allow Wei Ying to just accept all of the burdens and crimes (bad name) that have been put upon him.
红尘中 毁誉得失如何去量
Literal: In the mortal realm, fame and disgrace, how can it be measured?
Lyrical: In this world, how can you measure the slander and praise endured?
Xiao Zhan sings this part, and what is implied in the lyrics is different from this same line later on, when Yibo sings it. Wei Ying's life has been filled with slander and praise, fame and disgrace, and there is no way to go about measuring or balancing the fairness/unfairness of what has happened to him. The world is unfair, and there is no way to avoid this or measure it. There is nothing that Wei Ying could do to change the attitudes others had towards him. Within this line, you almost feel a hint of resignation.
萧萧血热刀锋凉
Literal: No matter how cold the blade, blood will forever run warm
Lyrical: The blade is ice cold, yet blood forever runs warm
I almost see this to show that no matter how cold Lan Zhan seems, his blood still runs warm, and becomes even more so when Wei Ying returns. To Wei Ying, no matter how many blades point at him, his blood still runs warm, he stays loyal to his own beliefs, and in the end, he comes back. It also shows that the blade and people's weapons are cold, and humans are the ones who have hearts. They are the ones in control of their actions. The heart will not become cold, even despite the injustice and violence in the world.
