Well, Tei have not shown any hint that he feels any romantic inclination to shuraka. He thinks about him all the time but its only because tei is not used to his actions and him being grown up, and shuraka is technically his guest. There is curiosity for sure, but not love. Also tei is very very much aware of how unsuited he is to shuraka, who is an emperor, that it prevents him from entertaining any thoughts of romance. Yes he is a man, it is an arranged marriage (that he painfully knows will not end well from his parent’s marriage)
I don’t like to analyze too much. But when the bottom came back to his country at first, he wanted to ask for help for top, and he also prayed everyday for him. You could not do that just because of political. Praying for someone safety for years. Even though the top only a child back then. Not even family prayed everyday for their relatives unless it is love one

Why is everyone think the bottom not in love with the top? The bottom thinks about the top all the time. But I think the bottom just feels that he is not suitable for the top because he is a man and from lesser country. Even if he is with top now, their fate would eventually end. That is why the love is cruel.