Which Character's Death was the Saddest and Most Painful in Money Heist?

Four major characters have died in Money Heist so far. Oslo’s death was the first death of a major character in the show. Helsinki’s brother was killed by a police officer who cracked open his skull by hitting his head with an iron road. The next person who dropped dead was Denver’s father, Moscow. Moscow was one of the most likeable character of the show. He was shot multiple times by the police while saving Tokyo. Berlin also sacrificed his life to buy enough time for the rest of the team to escape during season 2. Berlin’s character was tough and complex in Season 1 but during the last moments of his life, he proved to everyone that he is actually a compassionate person who is willing to die for the rest of his team. Last but not the least, one of the most emotional scenes of the whole series was the farewell of Nairobi. She was shot by a sniper when Sierra brought Nairobi’s son to lure her near the window. The team was still able to save her but unfortunately, Gandia shot her in the head, killing her instantly. There was only one death in season 4 and we hope that the death count doesn’t increase in Season 5 which is set to release soon. Which character’s death was the saddest for you? Which is the one character you never want to see dead?