オ when でしょう。 接続詞の when には、even though / although / despite the fact that... の意味で使われる場合があります。 〇 Why do you want a new job when you have a good one already? 〇 He says he doesn't have any money when in fact he has thousands of dollars in his account. 〇 I don't understand how he can say that everything's fine when it's so obvious that it's not. 〇 She claimed to be 18, when I know she's only 16.