His mother, Marina Treskunova, is a regional representative of OWL children's magazine, and his father, Aleksey Treskunov, has his own company which does transfer graphics.

In the summer of the same year he played in the criminal thriller Steel Butterfly (2012) by Renat Davletyarov in the small but prominent role of the homeless boy Karlik.

In the summer of 2014, the shooting of the fantasy-comedy Ghost by Alexander Voitinsky was finished in Moscow, where Semyon acted opposite Fyodor Bondarchuk.

The actor played the role of a "mama's boy" despised by classmates, who begins to pursue the ghost of a deceased aircraft designer.

Work in this picture, released on the screens in March of next year, was recognized by film critics as a great creative achievement of Treskunov.