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Born Konstantin Vasilev Kotsev on June 4, 1926 in the city of Istanbul, he entered the law faculty at the St.
Kliment Ohridski University of Sofia where he graduated in 1950.
Subsequently, he enrolled acting at The National Academy for Theatre and Film Arts graduating in 1958.
After the graduation, Kotsev was appointed in the Burgas Theatre for a year.
In 1959, he joined the troupe of the newly founded Satirical Theatre „Aleko Konstantinov“ in Sofia where he remained until 1984.
During the end of the 1980s, Kotsev was part of the Municipal Theatre of Sofia.
His film debut in a main role was in 1958 in the Bulgarian film classic On a Small Island directed by Rangel Valchanov.
Kotsev has a son Dimitar (born 1971) and a daughter Zornitsa (born 1972).
In the 17th century, a Bulgarian Christian region is selected by the Ottoman rulers to serve as an example of conversion to Islam. A Janissary who was kidnapped from the village as a boy is sent to force the reluctant inhabitants to convert. The Turkish governor seeks a peaceful solution, but ultimately torture, violence, and rebellion break out.
A tenement house needs to have steam heating installed. The residents find the necessary workers to do it, sign the contract and pay them in advance. The workers show up and start their job, but disappear immediately. Panic-stricken, the residents set up to search for them, only to find the workers in jail. Totally desperate, their only chance is to come up with an ingenious plan how to bring the work to the end.
Yanko, a young partisan, arrives in a small coastal town. He has to carry out a mission and return to his unit immediately. However, he runs into Armando, a former schoolmate. The guitarist Armando is genuinely overjoyed. He throws back a glass or two, plies his friend with questions, and indulges in memories. Yanko's heart is torn between conflicting emotions: Should he kill Armando and thus avoid the risk of detection? On the other hand, should he take a chance and spare his onetime friend? In a moment of lucidity, Armando realizes the tight spot that he is in. He offers the partisan his own, better clothes and wishes him god luck. Just when Armando is at his happiest, the police, who have mistaken him for the outlaw they want, shoot him.
In a white ward in a clinic a lifetime balance on the verge of death. Memories are herding together in the mind of seriously ill Aleksandrov, a scientist, who evaluates and reevaluates his own life: friendships, loves, career. Images of his youth are crowding in: of his beloved, of his children, of evenings, spent with his friends, ups and downs. And no one is able to say if all this made any difference.
Sofia, Bulgaria during World War II - Pesho, a poor boy from a working class family, falls in love with Violeta, a rich girl.
In the 1920s several dozen political prisoners are exiled on a small island in the Black Sea awaiting sentencing. The old sea wolf and adventurer Kostadin (nicknamed Costa Rica) is planning an escape together with а carpenter named Zheko, an idealistic student and a doctor.