Online exposure of "The Hidden Corner" suspected of copyright violation, how did the drama involve copyright violation?

As far as I know, The Hidden Corner has not publicly disclosed the details of the suspected copyright violation. However, generally speaking, any TV series or movie may involve copyright issues because the production company needs to obtain the permission of the original author to use their creativity and content. If 'The Hidden Corner' was indeed accused of violating the copyright of other works, it might be because it used some material from other works or it had similarities with other works in terms of plot, characters, etc. However, we need to wait until the truth of the case surfaced before we can understand the specific situation.