There is a modern TV series in which a man named Qiao Nan is a bodyguard to protect the princess.

The title of the play is Love Before Sunset, also known as May Time Condense and Retain the Afterglow of Sunset.

The following is the story introduction:

Katara Leah is the princess of the kingdom of Sherkalin. Because there are some political and harmful problems in her country, her father wants her to be in a safe country so that she doesn't have to face everything that happens. So after she graduated from Paris, her father sent her to a safe country-Thailand. She is a smart and confident girl. Her father doesn't want anyone to know that she is in Thailand, so they can disguise her identity.

Only three people know who she is, including Kathaleeya's guard. Tang is her bodyguard, but as far as he knows, she is the heir of a wealthy businessman in Chiang Mai, and her relatives ask her for property. Someone really followed Katarina in Thailand. Karin's general and her uncle sent men after katara Leah. On the day of arrival, because Tang installed monitoring facilities in the villa, it left a bad impression. Kathaleeya didn't talk to Don politely, and Don fought back, so she really didn't like each other at first. When the princess wants to go out, she always says she has something to do and refuses. She is a person who does things in her own way. She always lets him know who is the boss. He just works for her. They all think they are right. He almost got fired many times, but she always realized her mistake and apologized to him. When they went out together and took her for a walk in the city, they began to get closer and closer. Peng always reminds her that she can't fall in love with Tang because she is not alone with him. At this time, Tang had Catherine in his heart, and his ex-girlfriend Lin also appeared, and they had a fight. Lin's current boyfriend is the general's accomplice and has come to kill katara Leah. She knew that she could only get close to Don again, and then she could get close to Catherine and destroy her. Lin almost succeeded many times, but Tang saved the princess. Three months passed quickly. She went to his place and told Don that she was leaving. Tang was very sad. At this time, when Princess Xi Karin's uncle actually seized her father's power, Katarina was very shocked to see the news. So Tang also knew her true identity, but he was secretly disappointed. Tang resigned and left, but when she was sent back to see Karin, Tang saved her. They lived with Tang's parents, but he never forgave her. One night, she decided to go out. He went to find her and saw-Karin's police came and Don was shot. The princess knew that he loved her through his letters to her family. When he woke up, he took her out. That night, Lin found out where she lived, kidnapped katara Leah and locked her in a hotel room. Don collapsed. Finally, he realized that there was a clue in the ring he gave her, so he and his friend Pang sneaked into Xi-Karin to find her. They were taken to her father, and they searched for her every day. Finally, they knew where the princess was, but they were caught again. Don was tortured by the general where Katarina's father was, but he didn't tell the truth. Lin's boyfriend threatened the general to give him all the signing rights. The general took a fancy to Lin, so Lin's boyfriend gave her to this man. The general raped Lin. Lin decided to take revenge on Ayou and help the general catch Don and katara Leah. Lin died on the way to catch them. Katara Leah was reunited with her father, and with everyone's help, the state power of Xikalin returned to the king's hands. Don and Katrina know that they can't be together anymore. They are all very sad. Don is going back to Thailand. Peng gave him some advice. He realized that he should do what he wanted, so he went to see her. They spent the night together, and after a heart filled with each other, she returned to the palace. After the chivalrous ceremony, he also returned to Thailand, and only the sunset can prove their love. As a memory of their lives.

I don't know if it's the TV series you want! I hope I can help you! Hehe ~!