Hi  @Pingouinos 

thank you for reaching out to the community. 

Can you share a photo of wiring of the old switch and more of the community users may be able leave their ideas and insights below. 

For the Tapo S220 wiring: 

• Please try to examine the wiring for Tapo S220 as the following video or FAQ. 

Video: How to Set Up and Install Your Tapo Smart Light Switch (2 Gang 1 Way): Tapo S220

FAQ: How to install Tapo 2 Gang 1 Way Smart Light Switch

If the wiring looks quite different from the wiring in the video, it is better to reach a qualified electrical to identify the wires in the wall in person.  

For the two live wires in the wall, may I know do you have one or two switches,  and are those two live wires  for two different switches? 

Hi  @Pingouinos 

May I know were you able to install the tapo switch at last, if not , you may share a photo showing how the old switches are installed and wires you've identified,  so we could take a closer look at it.  Thanks!