No it's not it's happy end don't worry. Tho it gonna be long before it does
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If it's just the ending.
Sasha and Karel moved to america more like escaped to america. Sasha became a icon after proven that he was innocent (he admitted to being a spy, tho he isn't so that Karel/Skar who is the real spy won't get punished) ( they made a statue for him in France and his usual get up became like a trend)
Karel got another trial to clear his name and with Julian's influence and help they won clearing Karel's name.
Julian fell in love with Sasha's maid and courted her for 4yrs (I think) and they got married.
Sasha and Karel raised Charles.
It ended with Sasha's performance in US and Karel giving him a bouquet
Ohhhhhh. That was like mentioned but it was because of old age, it was cause Karel kept telling Sasha that if he didn't survive in France he would kill himself if Sasha died, Sasha took it as a joke. But it turned out that it wasn't.
It was briefly mentioned, that after Sasha's death Karel set up his funeral and went home then killed himself with a pistol
Can someone please spoil the end bc I feel like their ending is gonna be sad :(