Solve the key issue happening when updating sources by using apt-get

wget -q -O - https://archive.kali.org/archive-key.asc | apt-key add

Retrieved from https://www.kali.org/news/kali-linux-2018-1-release/

If the commands above still does not work, please execute the commands below:

wget https://http.kali.org/kali/pool/main/k/kali-archive-keyring/kali-archive-keyring_2018.1_all.deb
apt install ./kali-archive-keyring_2018.1_all.deb

Many thanks for the guidance of Frank, my coworker working at CCBNY.