Hot on the outside and cold on the inside, gentle type Shirogiri Black Seiko shou x possessive strong loyal dog type mindless following knight attack
[If you want to write it like this... It might be a little biased?
The time traveler accidentally got tricked by the system and crossed over to the wrong person, resulting in his own appearance being wiped out. The knight, a loyal subordinate of the boss of the original novel, the Son, received a guidebook at the beginning of the novel.
And, in addition to the "original novel" of the Magic Guide, the knight also learned about the fact that he and the Holy Son were targeted by many readers...