He recognize him when they bumped into him at the columbarium and had connected it to Tia being flustered afterwards.
He knew something must've happened between them but he was afraid to ask Tia about it.
So he decided to meet all his subordinates before they went to the tarmac and they have been guarding them around ever since.
He couldn't let his guard down knowing that Brandon is nearby.
He doesn't know what his capable off, all he knows is that he is obsess with his beloved.
So he activated his over protective mode just to make sure he kept Tia safe.
He wasn't planning on proposing to her that day, he was preparing something more extravagant for his proposal with fireworks and balloons.
but since there's an unknown threat around them he wanted to make sure that if something happens to him Tia would be taken care of.
He decided to propose right away just so to secure Tia's safety.
He came up with the plan for them to go to their next destination with him flying the aircraft.
It's a last minute move and he's relieved that he succeeded.
He figured that if Tia had the title as the official young madam of the Lee family his subordinates and even their familiar allies would not hesitate to help her should something unfortunate happen while he's away.
He knows that he wouldn't be around her all the time.
He had learned from his abduction that one cannot be careless.
He should always be vigilant.
And besides, he couldn't just simply keep her by his side cause Tia has her own dreams and goals too.
He wanted her to freely do her own thing. So he could only rely to his status as additional protection for her.
Tia was oblivious with everything that's happening.
He doesn't want her to worry.
All he wanted was for her to enjoy and have a good time.
He reckoned that he would be the one who would bear all the burden and just silently protect her.
He's thinking that when they got back to S City they will immediately get married and he would ask Tia to enroll to self defense classes.
Thinking of using the recreational activities suggested by Kenny as an excuse so she wouldn't suspect anything.
In all honesty, he's starting to get paranoid.
Unlike before, he used to fight his enemies upfront not really caring whether he would got hurt or even die.
But now he needs to consider Tia's safety and feelings.
Her protection and happiness is his top priority.
The chopper slowly descends on an empty grass land surrounded by tall trees.
Ian assisted Tia down the aircraft and guided her out of the grove.
As soon as they were out of the forest, Tia gasped as she saw where they were.