Receiving a gift from someone and giving back a gift of similar value is a fundamental rule of social interaction.
Bae Juhyun had always wanted to give Liu Xin'an a gift. As she had said before, they'd been together for so long, and she never gave him anything.
At least Liu Xin'an realized this and immediately made up for it by giving her a gift, but she kept hesitating.
However, to be fair, it's not like she never gave Liu Xin'an anything.
On the first day they met, she gave Liu Xin'an a music box!
That music box was still displayed in Liu Xin'an's workroom.
But okay, that didn't really count since it was a thank-you gift for a favor he'd done for her.
It was completely different from the kind of gift you give after confirming a relationship.
Seungwan's suggestion to cater to Liu Xin'an's likes was indeed enlightening for Bae Juhyun. As for her lack of understanding of gaming or computer accessories...
She decided to get outside help.